problem with \s prompt escape sequence

[ray]

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: sco3.2v5.0.4
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' 
-DCONF_OSTYPE='sco3.2v5.0.4' -DCONF_MACHTYPE='i386-pc-sco3.2v5.0.4' 
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H -DWAITPID_BROKEN -DPATH_MAX=1024  
-I.  -I. -I./include -I./lib  -g -O2
uname output: SCO_SV miami 3.2 2 i386
Machine Type: i386-pc-sco3.2v5.0.4

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
        the \s prompt variable returned 'bash' in version 2.05a-release
        and now returns '-bash' in 2.05b-release.

Repeat-By:
        set PS1=\s-\h\$ on my system it returns -bash-miami# instead of
        bash-miami#